Laminated container



May 3, 1938. s, 5M|TH v Re. 20,716

LAMINATED CONTAINER Original Filed Feb. 27, 1933 2 Sheets-Shegt awe/whoaSwan Smil'h y 1933- I 5 SMITH LAMINATED CONTAiNER O riginal F i l edFeb. 27, 1933 '2 Sheets-Sheet 2 gvwa/wfm Swan Smi th a 45 continuationof one another.

50 flange of the bottom.

Reissued May 3,1933

PATENT OFFICE 2am f LAMINATED CONTAINER Swan Smith, White. Bear, Minn,assignor, by direct and mesne assignments, of one-half to David G.Shepard, St. Paul, Minn, and onehalf to- Alfred. E. Metzger, White BearLake,

Original No. 1,995,523, March 26, 1935, Se-

rial No. 658,689, February 27, 1933. Appiication for reissue December 5,1935, Serial No.

13 Claims.

My invention relates to laminated containers and "has for its object toprovide a container and a method of forming the same, whereby a conicalcontainer may be constructed without waste of material.

- Another object of the invention resides in providing a containerhaving a bottom formed with a flange extending downwardly therefrom andin further providing a wall structure built about said flange." Anobject of the invention residesin providing a container in which thewall structure is formed from sheets of paper glued one upon the otherand of a width greater than the height of the container.

Astill further object of the invention resides in providing a containerin which the sheets used in the construction of the wall structureare'individually turned back at the lower marginal portion thereof andglued to the flange of the bottom and to one another. a

An object of the invention resides in providing a laminated papercontainer constructed of sheets I sheets for the purpose in which theends thereof are parallel to one another.

A still further object of the invention resides in utilizing sheetshaving the upper and lower edges thereof curved and of the same degreeof curva ture.

a plurality of said sheets and in arranging them one upon the other andin further constructing. said sheets with such a degree of curvaturethat the-upper curved edges of. the successive sheets placed one uponthe other register with or lie in A still further object of theinvention resides in employing a metal hoop disposed between thelaminations of the wall structure of the container and in placing saidhoop in proximity to the An object of the invention resides in arrangingsaid hoop so as .to project upwardly above the upper surface of thebottom to reinforce the container at the juncture between the wallstructure 55 andbottom.

' An object of the invention resides in utilizing Another object of theinvention resides in providing a method of constructing laminated papercontainers which'consists in wrapping sheets of paper one at ao 'cimeabout a mandrel against which a flanged bottom is held and in gluing thesame to the flange oi the bottom and to one another and which furtherconsists in arranging the sheets so that the lower marginal portionsthereof normallyproject outwardly beyond the ends of the flange andwhicnfurther consist in individually turning said projecting marginalportions of the sheets back upon the inner surface orthe flange as thesheets are applied and in gluing the same to said flange and to oneanother.

Other objects of the invention reside in the novel combination andarrangement of parts and in the details of construction hereinafterillustrated and/or described.

In the drawings:

Fig. 1 is a perspective view of a container illustrating an embodimentof my. invention.

Fig. 2 is a perspective view illustrating the method of constructing thecontainer and showing the container in inverted position.

Fig. 3 is a perspective view of the bottom of the container detachedtherefrom and viewed fromgthe underside thereof;

Fig. 4 is a perspective view of the hoop used with the container. Fig..5 is a developed view of the blanks from whlcht-he wall structure ofthe container is constructed illustrating the method of cutting the samefrom a roll of paper.

Fig. 6 is a perspective-view of a portion of the I finished containershown in Fig. 1 viewed from the underside thereof.

Fig. '7 is a sectional detail view taken on line of Fig. 6 and drawn toan enlarged scale.

manner of applying the individual sheets 01' the wall structure to thebottom.

tainers and particularly containers formed of paper, considerable wastehas heretofore occurred due to the necessity oi cutting the sheets fromwhich the container is constructed in theform of a truncated segment ofa circle. In addition, considerable difliculty has been "encountered inproperlysecuring the bottom to the'wall structure and in forming asufliciently rigid bottom structure to stand up under the. conditions towhich the container may be subjected; I The present invention provides acontainer in which these disadvantages are entirely overcome and bymeans oi which sheets may be cut without waste, the shee In theconstruction of conical laminated con Fig. 8 is a view similar to Fig. 7showing the being arranged to overlap and the overlap at the ends of thesheet and the marginal portion at the lower edges thereof being utilizedin the formation of the container. These disadvantages are furthereliminated by turning the sheets one at'a time about the flange. of thebottom so as to equalize the tension in all of the sheets and.

by further inserting a metal hoop between the various sheets forming thewall structure of the container, to stiffen and reinforce the'same.

My invention comprises a container illustrated at A in Fig. 1 which isparticularly adapted for use in shipping butter and similar commodities.

This container -compris'es a wall structure HI having a bottom llsecured thereto and open at its upper end as indicated at l2. A- hoop l3encircles the container at. the upper end thereof. Any suitable covermay be used with the container and such construction forming noparticular feature of this invention, has not been illustrated in thisapplication.

The bottom I I may be constructed of paper or any other suitablematerial. When constructed of paper a number of sheets of paper whichare indicated at H are employed which are circular in form and which areof a diameter somewhat greater than the diameter of the container at thelower end thereof. These sheets are glued one to the other and beforethe glue has set are placed in suitable dies and pressed to form aplaniform portion l5 adapted to extend across the bottom of thecontainer and a flange l6 depending from the planiform portion thereofas clearly shown in Figs. 3, 7 and 8 and adapted to lie against the in.-

ner surface of the container. This bottom is then" dried either in theatmosphere or in an oven to cause the glue to set, or, if preferred,heat may be applied in the dies so that the bottom is caused to take thedesired form when removed from the dies.

If desired, the flange l6 may issue at right angles to the planiformportion I5 of the bottom ll inwhich case the male die member is easilywithdrawn from the bottom after the same has been formed. If, however,the flange I6 is desired to taper to conform to the surface of thecontainer, the same may be accomplished by flrst constructing the flangeto lie at right angles to the planiform portion by. pressing the same insuitable dies and thereafter and before the glue is set, forcing theflange into a suitable conical hoop whereby the free edge of the flangeis drawn together and in thereafter causing the glue to set and to givethe flange a permanent form.

For building up the wall structure l0 of-the container individual sheetsof paper I! are employed which are cut transversely from a roll ofpaper, the unrolled portion of which is' indicated at 30. The sheets l9are of a length equal to the width of the paper 30 and the ends 3| and32 of these sheets which are formed through the lateral edges of thepaper coming from :the roll and are'parallel to one another. The sheetsl9 are severed from the roll by means of a cutter traveling in an arc-ofa circle.- The arc of the circle is such that when the sheets are rolledupon a suitable mandrel, the' upper edge 25 of the sheet forms a truecircle at the open end of the container. The next adjacent sheet issevered from the roll by means of the same cutter traveling in the sameare thereby forming the lower edge 26 of the sheet with the same degreeof curvature as the upper edge. Due to the fact that the container is inthe shape of a frustrum of a cone ,sions of the finished container.

edge 25. By means of this expedient an irregularity in the form of acrescent-shaped band 34 of material is left at the lower marginalportion 20 of the sheet which band is utilized in the formation of thecontainer as will be presently described. Likewise the ends 28 and 28 ofthe sheet I! are caused to overlap in the formation of the wallstructure of the container, which overlap is utilized to stiffen andreinforcethe container.

After the bottom is properly cured the wall structure is built upon thesame in the following manner: A mandrel diagrammatically indicated 'atI? in Figs. 2 and 8 is employed which is in the shape of a frustrum of acone and which is of dimensions-corresponding with the inner dimen- Theflange-l6 of the" bottom II is of such shape and dimensions as to lie incont-inuationof the circumferential surface of. the mandrel I 1 whenapplied to the end thereof. In the construction of the wall structurethe mandrel I1 is mounted upon a suitable support and the bottom H heldagainst the I end I8 thereof with the outer surface of the flange otherend 29 of the sheet caused to overlap said last-named portion of thesheet and to form a joint extending longitudinally of the container andindicated in its entirety by the reference numeral 3!. sheet, theoverlap is somewhatin the shape of a trapezoid increasing in widththroughout the length of the container and being of greatest width atthe lower end-thereof as clearly shown in Figs. 1 and 2. As the sheet'isapplied; the same.

adheres to the outer coated surface of the flange l6 of the bottom ll.After the sheet has been so applied and the ends thereof securedtogether,

the marginal portion 20 of the sheet is turned in 26, has the samecurvature as the upper edge, the I same will not form a true circle whenturned inwardly upon the inner surface 24 of flange l6. Sheet I9 is,however, so arranged that the medial portion 21 of the sheet just clearsthe under surface of the planiform portion l5 of bottom II. This causesthe edge 26 to recede from said bottom as best shown in Figs. 2, 6, and8, the marginal portion at the ends 28 and 29 of the sheet extendingwell inwardly of the lower edge 2| of the flange IS. The exact positionof the crescent shaped band 34 of the sheet can best be deter mined byan inspection of Fig. 7 which illustrates the position of thecorresponding part of the subsequent sheets.

After the first sheet I9 has been applied and glued to the flange l6 ofbottom H, other sheets 35, 36, 31 and 38 which are exactly ofthe sameshape as the sheet. 19 may be glued .to the sheet l9 and to one anotherand applied in the same:

Due to the particular shape of the struction of a container to cause thedesired strength with my invention the sheets may be made of sufficientlength and only five sheets employed. Where five sheets are utilized thejoint formed at the ends of each sheet would be disposed equidistantabout the circumference of the container so that the overlap of thevarious sheets would be uniformly distributed throughout thecircumference of the container and a container of uniform strengththroughout would result. This would be accomplished by rotating themandrel ll through one-fifth of a revolution and applying the next sheetat exactly the same location with respect to the support for the mandrelas the first sheet. The mandrelwould then be rotated another fifth of arevolution for each succeeding sheet untilall of the sheets had beenapplied. As each sheet is applied the marginal portion 20 thereof at thelower edge of the sheet is turned back upon the corresponding marginalportion of the previously applied sheet so that all of the said marginalportions are glued together andto the flange l6 of the bottom. Due tothe construction of the sheets as previously described, the

medial portions 21 of the sheet become distrib-' uted about the innersurface 24 ofiiange l6, whereby the doubled back part of the wallstructure is of uniform thickness about the circumference of the flangeand gradually tapers off to av single thickness at the juncture of theflange [6 with the planiform portion l5 of the bottom II. The particularmanner in which the various sheets lie one upon the other within theflange I5 is best shown in Fig. 6.

end of the container 'as'designated at 4| where I suihcient thicknessesof paper exist. By selecting paper of desired length the overlap of thejoints ll can be madeas great as desired. In the design of the containerthe elevation of the container where a strength equivalent to six sheetsof paper is required is determined. The length of the sheets is thenselected so that the apexes 42 formed between the edges BI" and 32 ofjuxtaposed sheets lie at such localities. The container is then of aminimum strength below sfich elevation equivalent to a containerconstructed of six sheets of paper and above such locality of a minimumstrength of a container constructed of live sheets of paper. The joints39 in addition to giving circumferential strength to the container formribs extending lengthwise of the container which serve to .stifien thesame and to lend longitudinal rigidity thereto. In this manner a muchstifi'er container can be formed the, container.

dling a reinforcing hoop shown in detail in Fig. 4 is employed which isimbedded within the interior of the wall structure Ill. This hoopconsists of a band of metal riveted, welded or otherwise securedtogether at its ends as designated at 44. This hoop isimbedded inbetween the layers of paper as the same are applied to'the mandrel.Where five sheets are utilized. sheets I9 and 35 are first placed uponthe mandrel and glued to the bottom I I and to one another. Hoop 43 isthen forced over the end of the bottom and upon the outer surface of thesheet 35 until the lower edge 45 of said hoop lies substantially flushwith the lower edge 2| of the flange IS. The

dled and allowed to drop on the flange of the container. Thev hoop 46further reinforces the flange and prevents breakagea'nd injury to thesame. My invention is highly advantageous in that the containers may beconstructed without waste of material. The portions of the sheet used inthe formation of the body structure which would ordinarily, be wastedare utilized to give both circumferential and longitudinal rigidity tothe container and to reduce/the total number of sheets of papernecessary. The container can be constructed in an extremely simpleandexpeditious manner, there being no waste to be handled and to be removedfrom the machine by means of which the container is built. By .in-

dividuallyfturning back, the marginal portions of the container at thelower edge of the sheets used in the wall structure equal tension isplaced upon each sheet and a much stronger and more substantialconstruction results. By the use oi the .hoop imbedded within the body'structure of the container, rigidity is given to the flange thereof. Atthe same time shearing of the wall structure of the container at thejuncture of the same at the bottom is entirely prevented.

Changes in the specific form of my invention, as herein disclosed, maybe made within the scope of what is claimed without departing from a thespirit of my invention.

Having described my invention, what I claim as new and desire to protectby Letters Patent is:

1. A conical container comprising a wall structure formed of sheets ofpaper glue'd one upon the other, said sheets being each of uniformlength to provide an overlap at the ends of the sheet varying in widththroughout the length of 2. A conical container comprising a wallstructure formed of sheets of paper glued one upon the other, saidsheets having parallel edges to provide an overlap at the ends of thesaid sheets varying in width throughout the length of the container.

3. A conical container comprising a wall structure formed of sheets ofpaper glued one upon the other, said sheets being formed with curvedupper and lower edges, both of the same curvature, the edges at one endof the container lying in alignment with one another, and the marginalportions of the sheets at the other end of the container being foldedback and glued together. 4. A conical container comprising a wall.structure formed of sheets of paper glued one upon the-other, saidsheets being formed with curved upper and lower edges, both'of .the samecurvature, the curvature of the edgeswi the sheets at the upper end ofthe container being such as to cause said edges to lie in alignment andthe. marginal portions of the sheets atthe other end of the containerbeing folded back and glued together.

'- 5. A conical container comprising a bottom having a flange issuingdownwardly therefrom, a wall' structure formed of sheets of paper gluedone upon the other, said sheets being formed with curved upper and loweredges, both of the same curvature, the edges at the upper end of thecontainer lying in alignment with one another and the marginal portionsof the sheets of the lower end of the container extending outwardlybeyond the flange of the bottom and being folded back upon said flangeand glued together and to said flange.

6. A container comprising a bottom having a flange issuing downwardlytherefrom, a wall structure comprising sheets of paper glued one uponthe other, the lower marginal portions of said sheets being folded backand glued to said flange and to one another, and a metal hoop imbeddedbetween said sheets of paper in proximity to the lower edge of saidflange.

7. A container comprising a bottom having a flange issuing downwardlytherefrom, a wall structure comprising sheets of paper glued one uponthe other, the lower marginal portions of said sheets being folded backand glued tosaid flange and to one another, and a metal hoop imbeddedbetween said sheets of paper in proximity to the lower edge of saidflange, said hoop extending'upwardlybeyond the upper surface of saidbottom, and reinforcing the container at the juncture between the bottomand wall structure.

8. A conical container having a wall structure constructed from aplurality of sheets of paper, each having straight parallel edges at theends thereof, said sheets being glued one upon the other with their endsoverlapping to form joints, the overlap being greater at the bottom ofthe wall structure than. at the top, said joints being distributedcircumferentially of said wall'structure and each thereof in partoverlyinga part of the adjacent joint.

9. A container circular in cross-section having a wall structureconstructed from a plurality of sheets of paper greater in number thanthree, said sheets being glued one upon the other with their endsoverlapping to form joints, the overlap being greater at one end of thewall structure than at the other end, said joints being substantiallyuniformly distributed circumferentially of the container.

- 10. A container having a wall structure constructed from a pluralityof sheets of paper, glued one upon the other with their ends overlappingto form joints, the overlap being greater at one end of the wallstructure than at the other end, each of said-joints in part overlying apart of the adjacent joint.

11. A conical container having a wall structure constructed from aplurality of sheets of paper, each formed with curved upper and loweredges,

both of the same curvature, said sheets being glued one upon the other,the curvature of the edges of the sheets being such as to cause saidedges at one end. of the wall structure to register substantially withone another, said sheets being relatively disposed circumferentially ofthe container to distribute about the same the irregularities betweenthe curved edges of the sheets at the other end of the container.

12. A paper container comprising inner and outer sheets of paper and aplurality of intermediate sheets of paper all glued together to form awall structure for the container, said sheets all overlapping in likemanner at their meeting edges, the amount of overlap of said sheetsvarying throughout the length of the container, the amount of overlapbeing greatest at the same end of the container, said sheets beingarranged so that the jo'intsol' the adjacent intermediate sheets aredisposed, at different localities in the wall structure to make thecontainer of substantially uniform thickness circumferential- .ly and ofa greater thickness where the overlap is the greatest.

13. A paper container comprising sheets of I paper glued one upon theother to form a wall structure for the container, all of said sheetsbeing constructed at their ends to form an overlapping joint at the endsof each sheet in the shape of a trapezoid with the base of the trapezoidat the bottom of the container, the joints of the sheets being disposedat different localities in'the wall structure and being arranged to makethe container of substantially uniform thickness circumferentially andof a greater thickness at the bases of the trapezoids.

SWAN SMITH;

